[SeaBIOS] about [SeaBIOS PATCH] Try to hard-reboot on rerun of post even on emulators.

Kevin O'Connor kevin at koconnor.net
Tue Apr 21 17:06:54 CEST 2015

On Tue, Apr 21, 2015 at 10:37:49AM +0200, Laszlo Ersek wrote:
> As to how you can fix
> <https://bugzilla.redhat.com/show_bug.cgi?id=1129549> (which is the
> motivation for this entire discussion):
> - You need to identify *what variable exactly* stores the list of
>   bootable devices. Is that a SeaBIOS variable? Is it some field in the
>   BDA (BIOS Data Area)? Something else? Because the bug is that this
>   variable, wherever it lives, is not re-set on reboot.
>   (Kevin, can you perhaps help with this question? Thank you.)

Prior to 244caf86 SeaBIOS attempted to manually reset all its internal
global variables on each boot.  This got too messy and error-prone, so
244caf86 was implemented.

As Laszlo states, my recollection is that one should be able to
continue to manually reset variables on each boot prior to 244caf86.
It should not (according to my recollection) be necessary to do
anything with the BDA or EBDA because SeaBIOS used to reset that on
every boot anyway.  Unfortunately, I don't know which global variable
not being reset would lead to the bugzilla entry above.


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